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# no-unused-private-class-members

[Added in v0.6.5](https://github.com/web-infra-dev/rslint/releases/tag/v0.6.5)
## Configuration

| Preset                   | Configured Value |
| ------------------------ | ---------------- |
| ✅ js.configs.recommended | `"error"`        |


```ts title=rslint.config.ts
import { defineConfig, js } from '@rslint/core';

export default defineConfig([
  js.configs.recommended,
  {
    rules: {
      'no-unused-private-class-members': 'error',
    },
  },
]);
```

## Rule Details

This rule reports private class members that are declared but never used.

A private field or method is considered unused if its value is never read. A
private accessor is considered unused if it is never accessed, either for a read
or a write.

Examples of **incorrect** code for this rule:

```javascript
class A {
    #unusedMember = 5;
}

class B {
    #usedOnlyInWrite = 5;
    method() {
        this.#usedOnlyInWrite = 42;
    }
}

class C {
    #usedOnlyToUpdateItself = 5;
    method() {
        this.#usedOnlyToUpdateItself++;
    }
}

class D {
    #unusedMethod() {}
}
```

Examples of **correct** code for this rule:

```javascript
class A {
    #usedMember = 42;
    method() {
        return this.#usedMember;
    }
}

class B {
    #usedMethod() {
        return 42;
    }
    anotherMethod() {
        return this.#usedMethod();
    }
}

class C {
    get #usedAccessor() {}
    set #usedAccessor(value) {}

    method() {
        this.#usedAccessor = 42;
    }
}
```

## Options

This rule has no options.

## Original Documentation

- [ESLint: no-unused-private-class-members](https://eslint.org/docs/latest/rules/no-unused-private-class-members)
- [Source code](https://github.com/eslint/eslint/blob/v10.8.1/lib/rules/no-unused-private-class-members.js)